1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * The IP to API glue. 7 * 8 * Authors: see ip.c 9 * 10 * Fixes: 11 * Many : Split from ip.c , see ip.c for history. 12 * Martin Mares : TOS setting fixed. 13 * Alan Cox : Fixed a couple of oopses in Martin's 14 * TOS tweaks. 15 * Mike McLagan : Routing by source 16 */ 17 18 #include <linux/module.h> 19 #include <linux/types.h> 20 #include <linux/mm.h> 21 #include <linux/skbuff.h> 22 #include <linux/ip.h> 23 #include <linux/icmp.h> 24 #include <linux/inetdevice.h> 25 #include <linux/netdevice.h> 26 #include <net/sock.h> 27 #include <net/ip.h> 28 #include <net/icmp.h> 29 #include <net/tcp_states.h> 30 #include <linux/udp.h> 31 #include <linux/igmp.h> 32 #include <linux/netfilter.h> 33 #include <linux/route.h> 34 #include <linux/mroute.h> 35 #include <net/route.h> 36 #include <net/xfrm.h> 37 #include <net/compat.h> 38 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 39 #include <net/transp_v6.h> 40 #endif 41 42 #include <linux/errqueue.h> 43 #include <asm/uaccess.h> 44 45 #define IP_CMSG_PKTINFO 1 46 #define IP_CMSG_TTL 2 47 #define IP_CMSG_TOS 4 48 #define IP_CMSG_RECVOPTS 8 49 #define IP_CMSG_RETOPTS 16 50 #define IP_CMSG_PASSSEC 32 51 52 /* 53 * SOL_IP control messages. 54 */ 55 56 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) 57 { 58 struct in_pktinfo info; 59 struct rtable *rt = skb->rtable; 60 61 info.ipi_addr.s_addr = ip_hdr(skb)->daddr; 62 if (rt) { 63 info.ipi_ifindex = rt->rt_iif; 64 info.ipi_spec_dst.s_addr = rt->rt_spec_dst; 65 } else { 66 info.ipi_ifindex = 0; 67 info.ipi_spec_dst.s_addr = 0; 68 } 69 70 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 71 } 72 73 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb) 74 { 75 int ttl = ip_hdr(skb)->ttl; 76 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl); 77 } 78 79 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb) 80 { 81 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos); 82 } 83 84 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb) 85 { 86 if (IPCB(skb)->opt.optlen == 0) 87 return; 88 89 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, 90 ip_hdr(skb) + 1); 91 } 92 93 94 static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb) 95 { 96 unsigned char optbuf[sizeof(struct ip_options) + 40]; 97 struct ip_options * opt = (struct ip_options*)optbuf; 98 99 if (IPCB(skb)->opt.optlen == 0) 100 return; 101 102 if (ip_options_echo(opt, skb)) { 103 msg->msg_flags |= MSG_CTRUNC; 104 return; 105 } 106 ip_options_undo(opt); 107 108 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data); 109 } 110 111 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) 112 { 113 char *secdata; 114 u32 seclen, secid; 115 int err; 116 117 err = security_socket_getpeersec_dgram(NULL, skb, &secid); 118 if (err) 119 return; 120 121 err = security_secid_to_secctx(secid, &secdata, &seclen); 122 if (err) 123 return; 124 125 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); 126 security_release_secctx(secdata, seclen); 127 } 128 129 130 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) 131 { 132 struct inet_sock *inet = inet_sk(skb->sk); 133 unsigned flags = inet->cmsg_flags; 134 135 /* Ordered by supposed usage frequency */ 136 if (flags & 1) 137 ip_cmsg_recv_pktinfo(msg, skb); 138 if ((flags>>=1) == 0) 139 return; 140 141 if (flags & 1) 142 ip_cmsg_recv_ttl(msg, skb); 143 if ((flags>>=1) == 0) 144 return; 145 146 if (flags & 1) 147 ip_cmsg_recv_tos(msg, skb); 148 if ((flags>>=1) == 0) 149 return; 150 151 if (flags & 1) 152 ip_cmsg_recv_opts(msg, skb); 153 if ((flags>>=1) == 0) 154 return; 155 156 if (flags & 1) 157 ip_cmsg_recv_retopts(msg, skb); 158 if ((flags>>=1) == 0) 159 return; 160 161 if (flags & 1) 162 ip_cmsg_recv_security(msg, skb); 163 } 164 165 int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc) 166 { 167 int err; 168 struct cmsghdr *cmsg; 169 170 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { 171 if (!CMSG_OK(msg, cmsg)) 172 return -EINVAL; 173 if (cmsg->cmsg_level != SOL_IP) 174 continue; 175 switch (cmsg->cmsg_type) { 176 case IP_RETOPTS: 177 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); 178 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40); 179 if (err) 180 return err; 181 break; 182 case IP_PKTINFO: 183 { 184 struct in_pktinfo *info; 185 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) 186 return -EINVAL; 187 info = (struct in_pktinfo *)CMSG_DATA(cmsg); 188 ipc->oif = info->ipi_ifindex; 189 ipc->addr = info->ipi_spec_dst.s_addr; 190 break; 191 } 192 default: 193 return -EINVAL; 194 } 195 } 196 return 0; 197 } 198 199 200 /* Special input handler for packets caught by router alert option. 201 They are selected only by protocol field, and then processed likely 202 local ones; but only if someone wants them! Otherwise, router 203 not running rsvpd will kill RSVP. 204 205 It is user level problem, what it will make with them. 206 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), 207 but receiver should be enough clever f.e. to forward mtrace requests, 208 sent to multicast group to reach destination designated router. 209 */ 210 struct ip_ra_chain *ip_ra_chain; 211 DEFINE_RWLOCK(ip_ra_lock); 212 213 int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *)) 214 { 215 struct ip_ra_chain *ra, *new_ra, **rap; 216 217 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num == IPPROTO_RAW) 218 return -EINVAL; 219 220 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; 221 222 write_lock_bh(&ip_ra_lock); 223 for (rap = &ip_ra_chain; (ra=*rap) != NULL; rap = &ra->next) { 224 if (ra->sk == sk) { 225 if (on) { 226 write_unlock_bh(&ip_ra_lock); 227 kfree(new_ra); 228 return -EADDRINUSE; 229 } 230 *rap = ra->next; 231 write_unlock_bh(&ip_ra_lock); 232 233 if (ra->destructor) 234 ra->destructor(sk); 235 sock_put(sk); 236 kfree(ra); 237 return 0; 238 } 239 } 240 if (new_ra == NULL) { 241 write_unlock_bh(&ip_ra_lock); 242 return -ENOBUFS; 243 } 244 new_ra->sk = sk; 245 new_ra->destructor = destructor; 246 247 new_ra->next = ra; 248 *rap = new_ra; 249 sock_hold(sk); 250 write_unlock_bh(&ip_ra_lock); 251 252 return 0; 253 } 254 255 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 256 __be16 port, u32 info, u8 *payload) 257 { 258 struct inet_sock *inet = inet_sk(sk); 259 struct sock_exterr_skb *serr; 260 261 if (!inet->recverr) 262 return; 263 264 skb = skb_clone(skb, GFP_ATOMIC); 265 if (!skb) 266 return; 267 268 serr = SKB_EXT_ERR(skb); 269 serr->ee.ee_errno = err; 270 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; 271 serr->ee.ee_type = icmp_hdr(skb)->type; 272 serr->ee.ee_code = icmp_hdr(skb)->code; 273 serr->ee.ee_pad = 0; 274 serr->ee.ee_info = info; 275 serr->ee.ee_data = 0; 276 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - 277 skb_network_header(skb); 278 serr->port = port; 279 280 if (skb_pull(skb, payload - skb->data) != NULL) { 281 skb_reset_transport_header(skb); 282 if (sock_queue_err_skb(sk, skb) == 0) 283 return; 284 } 285 kfree_skb(skb); 286 } 287 288 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) 289 { 290 struct inet_sock *inet = inet_sk(sk); 291 struct sock_exterr_skb *serr; 292 struct iphdr *iph; 293 struct sk_buff *skb; 294 295 if (!inet->recverr) 296 return; 297 298 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); 299 if (!skb) 300 return; 301 302 skb_put(skb, sizeof(struct iphdr)); 303 skb_reset_network_header(skb); 304 iph = ip_hdr(skb); 305 iph->daddr = daddr; 306 307 serr = SKB_EXT_ERR(skb); 308 serr->ee.ee_errno = err; 309 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 310 serr->ee.ee_type = 0; 311 serr->ee.ee_code = 0; 312 serr->ee.ee_pad = 0; 313 serr->ee.ee_info = info; 314 serr->ee.ee_data = 0; 315 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 316 serr->port = port; 317 318 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 319 skb_reset_transport_header(skb); 320 321 if (sock_queue_err_skb(sk, skb)) 322 kfree_skb(skb); 323 } 324 325 /* 326 * Handle MSG_ERRQUEUE 327 */ 328 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len) 329 { 330 struct sock_exterr_skb *serr; 331 struct sk_buff *skb, *skb2; 332 struct sockaddr_in *sin; 333 struct { 334 struct sock_extended_err ee; 335 struct sockaddr_in offender; 336 } errhdr; 337 int err; 338 int copied; 339 340 err = -EAGAIN; 341 skb = skb_dequeue(&sk->sk_error_queue); 342 if (skb == NULL) 343 goto out; 344 345 copied = skb->len; 346 if (copied > len) { 347 msg->msg_flags |= MSG_TRUNC; 348 copied = len; 349 } 350 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 351 if (err) 352 goto out_free_skb; 353 354 sock_recv_timestamp(msg, sk, skb); 355 356 serr = SKB_EXT_ERR(skb); 357 358 sin = (struct sockaddr_in *)msg->msg_name; 359 if (sin) { 360 sin->sin_family = AF_INET; 361 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + 362 serr->addr_offset); 363 sin->sin_port = serr->port; 364 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 365 } 366 367 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 368 sin = &errhdr.offender; 369 sin->sin_family = AF_UNSPEC; 370 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) { 371 struct inet_sock *inet = inet_sk(sk); 372 373 sin->sin_family = AF_INET; 374 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 375 sin->sin_port = 0; 376 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 377 if (inet->cmsg_flags) 378 ip_cmsg_recv(msg, skb); 379 } 380 381 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); 382 383 /* Now we could try to dump offended packet options */ 384 385 msg->msg_flags |= MSG_ERRQUEUE; 386 err = copied; 387 388 /* Reset and regenerate socket error */ 389 spin_lock_bh(&sk->sk_error_queue.lock); 390 sk->sk_err = 0; 391 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { 392 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; 393 spin_unlock_bh(&sk->sk_error_queue.lock); 394 sk->sk_error_report(sk); 395 } else 396 spin_unlock_bh(&sk->sk_error_queue.lock); 397 398 out_free_skb: 399 kfree_skb(skb); 400 out: 401 return err; 402 } 403 404 405 /* 406 * Socket option code for IP. This is the end of the line after any TCP,UDP etc options on 407 * an IP socket. 408 */ 409 410 static int do_ip_setsockopt(struct sock *sk, int level, 411 int optname, char __user *optval, int optlen) 412 { 413 struct inet_sock *inet = inet_sk(sk); 414 int val=0,err; 415 416 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) | 417 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) | 418 (1<<IP_RETOPTS) | (1<<IP_TOS) | 419 (1<<IP_TTL) | (1<<IP_HDRINCL) | 420 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) | 421 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) | 422 (1<<IP_PASSSEC))) || 423 optname == IP_MULTICAST_TTL || 424 optname == IP_MULTICAST_LOOP) { 425 if (optlen >= sizeof(int)) { 426 if (get_user(val, (int __user *) optval)) 427 return -EFAULT; 428 } else if (optlen >= sizeof(char)) { 429 unsigned char ucval; 430 431 if (get_user(ucval, (unsigned char __user *) optval)) 432 return -EFAULT; 433 val = (int) ucval; 434 } 435 } 436 437 /* If optlen==0, it is equivalent to val == 0 */ 438 439 if (ip_mroute_opt(optname)) 440 return ip_mroute_setsockopt(sk,optname,optval,optlen); 441 442 err = 0; 443 lock_sock(sk); 444 445 switch (optname) { 446 case IP_OPTIONS: 447 { 448 struct ip_options * opt = NULL; 449 if (optlen > 40 || optlen < 0) 450 goto e_inval; 451 err = ip_options_get_from_user(sock_net(sk), &opt, 452 optval, optlen); 453 if (err) 454 break; 455 if (inet->is_icsk) { 456 struct inet_connection_sock *icsk = inet_csk(sk); 457 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 458 if (sk->sk_family == PF_INET || 459 (!((1 << sk->sk_state) & 460 (TCPF_LISTEN | TCPF_CLOSE)) && 461 inet->daddr != LOOPBACK4_IPV6)) { 462 #endif 463 if (inet->opt) 464 icsk->icsk_ext_hdr_len -= inet->opt->optlen; 465 if (opt) 466 icsk->icsk_ext_hdr_len += opt->optlen; 467 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 468 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 469 } 470 #endif 471 } 472 opt = xchg(&inet->opt, opt); 473 kfree(opt); 474 break; 475 } 476 case IP_PKTINFO: 477 if (val) 478 inet->cmsg_flags |= IP_CMSG_PKTINFO; 479 else 480 inet->cmsg_flags &= ~IP_CMSG_PKTINFO; 481 break; 482 case IP_RECVTTL: 483 if (val) 484 inet->cmsg_flags |= IP_CMSG_TTL; 485 else 486 inet->cmsg_flags &= ~IP_CMSG_TTL; 487 break; 488 case IP_RECVTOS: 489 if (val) 490 inet->cmsg_flags |= IP_CMSG_TOS; 491 else 492 inet->cmsg_flags &= ~IP_CMSG_TOS; 493 break; 494 case IP_RECVOPTS: 495 if (val) 496 inet->cmsg_flags |= IP_CMSG_RECVOPTS; 497 else 498 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; 499 break; 500 case IP_RETOPTS: 501 if (val) 502 inet->cmsg_flags |= IP_CMSG_RETOPTS; 503 else 504 inet->cmsg_flags &= ~IP_CMSG_RETOPTS; 505 break; 506 case IP_PASSSEC: 507 if (val) 508 inet->cmsg_flags |= IP_CMSG_PASSSEC; 509 else 510 inet->cmsg_flags &= ~IP_CMSG_PASSSEC; 511 break; 512 case IP_TOS: /* This sets both TOS and Precedence */ 513 if (sk->sk_type == SOCK_STREAM) { 514 val &= ~3; 515 val |= inet->tos & 3; 516 } 517 if (inet->tos != val) { 518 inet->tos = val; 519 sk->sk_priority = rt_tos2priority(val); 520 sk_dst_reset(sk); 521 } 522 break; 523 case IP_TTL: 524 if (optlen<1) 525 goto e_inval; 526 if (val != -1 && (val < 1 || val>255)) 527 goto e_inval; 528 inet->uc_ttl = val; 529 break; 530 case IP_HDRINCL: 531 if (sk->sk_type != SOCK_RAW) { 532 err = -ENOPROTOOPT; 533 break; 534 } 535 inet->hdrincl = val ? 1 : 0; 536 break; 537 case IP_MTU_DISCOVER: 538 if (val<0 || val>3) 539 goto e_inval; 540 inet->pmtudisc = val; 541 break; 542 case IP_RECVERR: 543 inet->recverr = !!val; 544 if (!val) 545 skb_queue_purge(&sk->sk_error_queue); 546 break; 547 case IP_MULTICAST_TTL: 548 if (sk->sk_type == SOCK_STREAM) 549 goto e_inval; 550 if (optlen<1) 551 goto e_inval; 552 if (val==-1) 553 val = 1; 554 if (val < 0 || val > 255) 555 goto e_inval; 556 inet->mc_ttl = val; 557 break; 558 case IP_MULTICAST_LOOP: 559 if (optlen<1) 560 goto e_inval; 561 inet->mc_loop = !!val; 562 break; 563 case IP_MULTICAST_IF: 564 { 565 struct ip_mreqn mreq; 566 struct net_device *dev = NULL; 567 568 if (sk->sk_type == SOCK_STREAM) 569 goto e_inval; 570 /* 571 * Check the arguments are allowable 572 */ 573 574 err = -EFAULT; 575 if (optlen >= sizeof(struct ip_mreqn)) { 576 if (copy_from_user(&mreq,optval,sizeof(mreq))) 577 break; 578 } else { 579 memset(&mreq, 0, sizeof(mreq)); 580 if (optlen >= sizeof(struct in_addr) && 581 copy_from_user(&mreq.imr_address,optval,sizeof(struct in_addr))) 582 break; 583 } 584 585 if (!mreq.imr_ifindex) { 586 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { 587 inet->mc_index = 0; 588 inet->mc_addr = 0; 589 err = 0; 590 break; 591 } 592 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); 593 if (dev) { 594 mreq.imr_ifindex = dev->ifindex; 595 dev_put(dev); 596 } 597 } else 598 dev = __dev_get_by_index(sock_net(sk), mreq.imr_ifindex); 599 600 601 err = -EADDRNOTAVAIL; 602 if (!dev) 603 break; 604 605 err = -EINVAL; 606 if (sk->sk_bound_dev_if && 607 mreq.imr_ifindex != sk->sk_bound_dev_if) 608 break; 609 610 inet->mc_index = mreq.imr_ifindex; 611 inet->mc_addr = mreq.imr_address.s_addr; 612 err = 0; 613 break; 614 } 615 616 case IP_ADD_MEMBERSHIP: 617 case IP_DROP_MEMBERSHIP: 618 { 619 struct ip_mreqn mreq; 620 621 err = -EPROTO; 622 if (inet_sk(sk)->is_icsk) 623 break; 624 625 if (optlen < sizeof(struct ip_mreq)) 626 goto e_inval; 627 err = -EFAULT; 628 if (optlen >= sizeof(struct ip_mreqn)) { 629 if (copy_from_user(&mreq,optval,sizeof(mreq))) 630 break; 631 } else { 632 memset(&mreq, 0, sizeof(mreq)); 633 if (copy_from_user(&mreq,optval,sizeof(struct ip_mreq))) 634 break; 635 } 636 637 if (optname == IP_ADD_MEMBERSHIP) 638 err = ip_mc_join_group(sk, &mreq); 639 else 640 err = ip_mc_leave_group(sk, &mreq); 641 break; 642 } 643 case IP_MSFILTER: 644 { 645 extern int sysctl_igmp_max_msf; 646 struct ip_msfilter *msf; 647 648 if (optlen < IP_MSFILTER_SIZE(0)) 649 goto e_inval; 650 if (optlen > sysctl_optmem_max) { 651 err = -ENOBUFS; 652 break; 653 } 654 msf = kmalloc(optlen, GFP_KERNEL); 655 if (!msf) { 656 err = -ENOBUFS; 657 break; 658 } 659 err = -EFAULT; 660 if (copy_from_user(msf, optval, optlen)) { 661 kfree(msf); 662 break; 663 } 664 /* numsrc >= (1G-4) overflow in 32 bits */ 665 if (msf->imsf_numsrc >= 0x3ffffffcU || 666 msf->imsf_numsrc > sysctl_igmp_max_msf) { 667 kfree(msf); 668 err = -ENOBUFS; 669 break; 670 } 671 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { 672 kfree(msf); 673 err = -EINVAL; 674 break; 675 } 676 err = ip_mc_msfilter(sk, msf, 0); 677 kfree(msf); 678 break; 679 } 680 case IP_BLOCK_SOURCE: 681 case IP_UNBLOCK_SOURCE: 682 case IP_ADD_SOURCE_MEMBERSHIP: 683 case IP_DROP_SOURCE_MEMBERSHIP: 684 { 685 struct ip_mreq_source mreqs; 686 int omode, add; 687 688 if (optlen != sizeof(struct ip_mreq_source)) 689 goto e_inval; 690 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { 691 err = -EFAULT; 692 break; 693 } 694 if (optname == IP_BLOCK_SOURCE) { 695 omode = MCAST_EXCLUDE; 696 add = 1; 697 } else if (optname == IP_UNBLOCK_SOURCE) { 698 omode = MCAST_EXCLUDE; 699 add = 0; 700 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { 701 struct ip_mreqn mreq; 702 703 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; 704 mreq.imr_address.s_addr = mreqs.imr_interface; 705 mreq.imr_ifindex = 0; 706 err = ip_mc_join_group(sk, &mreq); 707 if (err && err != -EADDRINUSE) 708 break; 709 omode = MCAST_INCLUDE; 710 add = 1; 711 } else /* IP_DROP_SOURCE_MEMBERSHIP */ { 712 omode = MCAST_INCLUDE; 713 add = 0; 714 } 715 err = ip_mc_source(add, omode, sk, &mreqs, 0); 716 break; 717 } 718 case MCAST_JOIN_GROUP: 719 case MCAST_LEAVE_GROUP: 720 { 721 struct group_req greq; 722 struct sockaddr_in *psin; 723 struct ip_mreqn mreq; 724 725 if (optlen < sizeof(struct group_req)) 726 goto e_inval; 727 err = -EFAULT; 728 if (copy_from_user(&greq, optval, sizeof(greq))) 729 break; 730 psin = (struct sockaddr_in *)&greq.gr_group; 731 if (psin->sin_family != AF_INET) 732 goto e_inval; 733 memset(&mreq, 0, sizeof(mreq)); 734 mreq.imr_multiaddr = psin->sin_addr; 735 mreq.imr_ifindex = greq.gr_interface; 736 737 if (optname == MCAST_JOIN_GROUP) 738 err = ip_mc_join_group(sk, &mreq); 739 else 740 err = ip_mc_leave_group(sk, &mreq); 741 break; 742 } 743 case MCAST_JOIN_SOURCE_GROUP: 744 case MCAST_LEAVE_SOURCE_GROUP: 745 case MCAST_BLOCK_SOURCE: 746 case MCAST_UNBLOCK_SOURCE: 747 { 748 struct group_source_req greqs; 749 struct ip_mreq_source mreqs; 750 struct sockaddr_in *psin; 751 int omode, add; 752 753 if (optlen != sizeof(struct group_source_req)) 754 goto e_inval; 755 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 756 err = -EFAULT; 757 break; 758 } 759 if (greqs.gsr_group.ss_family != AF_INET || 760 greqs.gsr_source.ss_family != AF_INET) { 761 err = -EADDRNOTAVAIL; 762 break; 763 } 764 psin = (struct sockaddr_in *)&greqs.gsr_group; 765 mreqs.imr_multiaddr = psin->sin_addr.s_addr; 766 psin = (struct sockaddr_in *)&greqs.gsr_source; 767 mreqs.imr_sourceaddr = psin->sin_addr.s_addr; 768 mreqs.imr_interface = 0; /* use index for mc_source */ 769 770 if (optname == MCAST_BLOCK_SOURCE) { 771 omode = MCAST_EXCLUDE; 772 add = 1; 773 } else if (optname == MCAST_UNBLOCK_SOURCE) { 774 omode = MCAST_EXCLUDE; 775 add = 0; 776 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 777 struct ip_mreqn mreq; 778 779 psin = (struct sockaddr_in *)&greqs.gsr_group; 780 mreq.imr_multiaddr = psin->sin_addr; 781 mreq.imr_address.s_addr = 0; 782 mreq.imr_ifindex = greqs.gsr_interface; 783 err = ip_mc_join_group(sk, &mreq); 784 if (err && err != -EADDRINUSE) 785 break; 786 greqs.gsr_interface = mreq.imr_ifindex; 787 omode = MCAST_INCLUDE; 788 add = 1; 789 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 790 omode = MCAST_INCLUDE; 791 add = 0; 792 } 793 err = ip_mc_source(add, omode, sk, &mreqs, 794 greqs.gsr_interface); 795 break; 796 } 797 case MCAST_MSFILTER: 798 { 799 extern int sysctl_igmp_max_msf; 800 struct sockaddr_in *psin; 801 struct ip_msfilter *msf = NULL; 802 struct group_filter *gsf = NULL; 803 int msize, i, ifindex; 804 805 if (optlen < GROUP_FILTER_SIZE(0)) 806 goto e_inval; 807 if (optlen > sysctl_optmem_max) { 808 err = -ENOBUFS; 809 break; 810 } 811 gsf = kmalloc(optlen,GFP_KERNEL); 812 if (!gsf) { 813 err = -ENOBUFS; 814 break; 815 } 816 err = -EFAULT; 817 if (copy_from_user(gsf, optval, optlen)) { 818 goto mc_msf_out; 819 } 820 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 821 if (gsf->gf_numsrc >= 0x1ffffff || 822 gsf->gf_numsrc > sysctl_igmp_max_msf) { 823 err = -ENOBUFS; 824 goto mc_msf_out; 825 } 826 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 827 err = -EINVAL; 828 goto mc_msf_out; 829 } 830 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); 831 msf = kmalloc(msize,GFP_KERNEL); 832 if (!msf) { 833 err = -ENOBUFS; 834 goto mc_msf_out; 835 } 836 ifindex = gsf->gf_interface; 837 psin = (struct sockaddr_in *)&gsf->gf_group; 838 if (psin->sin_family != AF_INET) { 839 err = -EADDRNOTAVAIL; 840 goto mc_msf_out; 841 } 842 msf->imsf_multiaddr = psin->sin_addr.s_addr; 843 msf->imsf_interface = 0; 844 msf->imsf_fmode = gsf->gf_fmode; 845 msf->imsf_numsrc = gsf->gf_numsrc; 846 err = -EADDRNOTAVAIL; 847 for (i=0; i<gsf->gf_numsrc; ++i) { 848 psin = (struct sockaddr_in *)&gsf->gf_slist[i]; 849 850 if (psin->sin_family != AF_INET) 851 goto mc_msf_out; 852 msf->imsf_slist[i] = psin->sin_addr.s_addr; 853 } 854 kfree(gsf); 855 gsf = NULL; 856 857 err = ip_mc_msfilter(sk, msf, ifindex); 858 mc_msf_out: 859 kfree(msf); 860 kfree(gsf); 861 break; 862 } 863 case IP_ROUTER_ALERT: 864 err = ip_ra_control(sk, val ? 1 : 0, NULL); 865 break; 866 867 case IP_FREEBIND: 868 if (optlen<1) 869 goto e_inval; 870 inet->freebind = !!val; 871 break; 872 873 case IP_IPSEC_POLICY: 874 case IP_XFRM_POLICY: 875 err = -EPERM; 876 if (!capable(CAP_NET_ADMIN)) 877 break; 878 err = xfrm_user_policy(sk, optname, optval, optlen); 879 break; 880 881 default: 882 err = -ENOPROTOOPT; 883 break; 884 } 885 release_sock(sk); 886 return err; 887 888 e_inval: 889 release_sock(sk); 890 return -EINVAL; 891 } 892 893 int ip_setsockopt(struct sock *sk, int level, 894 int optname, char __user *optval, int optlen) 895 { 896 int err; 897 898 if (level != SOL_IP) 899 return -ENOPROTOOPT; 900 901 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 902 #ifdef CONFIG_NETFILTER 903 /* we need to exclude all possible ENOPROTOOPTs except default case */ 904 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 905 optname != IP_IPSEC_POLICY && 906 optname != IP_XFRM_POLICY && 907 !ip_mroute_opt(optname)) { 908 lock_sock(sk); 909 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); 910 release_sock(sk); 911 } 912 #endif 913 return err; 914 } 915 916 #ifdef CONFIG_COMPAT 917 int compat_ip_setsockopt(struct sock *sk, int level, int optname, 918 char __user *optval, int optlen) 919 { 920 int err; 921 922 if (level != SOL_IP) 923 return -ENOPROTOOPT; 924 925 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) 926 return compat_mc_setsockopt(sk, level, optname, optval, optlen, 927 ip_setsockopt); 928 929 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 930 #ifdef CONFIG_NETFILTER 931 /* we need to exclude all possible ENOPROTOOPTs except default case */ 932 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 933 optname != IP_IPSEC_POLICY && 934 optname != IP_XFRM_POLICY && 935 !ip_mroute_opt(optname)) { 936 lock_sock(sk); 937 err = compat_nf_setsockopt(sk, PF_INET, optname, 938 optval, optlen); 939 release_sock(sk); 940 } 941 #endif 942 return err; 943 } 944 945 EXPORT_SYMBOL(compat_ip_setsockopt); 946 #endif 947 948 /* 949 * Get the options. Note for future reference. The GET of IP options gets the 950 * _received_ ones. The set sets the _sent_ ones. 951 */ 952 953 static int do_ip_getsockopt(struct sock *sk, int level, int optname, 954 char __user *optval, int __user *optlen) 955 { 956 struct inet_sock *inet = inet_sk(sk); 957 int val; 958 int len; 959 960 if (level != SOL_IP) 961 return -EOPNOTSUPP; 962 963 if (ip_mroute_opt(optname)) 964 return ip_mroute_getsockopt(sk,optname,optval,optlen); 965 966 if (get_user(len,optlen)) 967 return -EFAULT; 968 if (len < 0) 969 return -EINVAL; 970 971 lock_sock(sk); 972 973 switch (optname) { 974 case IP_OPTIONS: 975 { 976 unsigned char optbuf[sizeof(struct ip_options)+40]; 977 struct ip_options * opt = (struct ip_options*)optbuf; 978 opt->optlen = 0; 979 if (inet->opt) 980 memcpy(optbuf, inet->opt, 981 sizeof(struct ip_options)+ 982 inet->opt->optlen); 983 release_sock(sk); 984 985 if (opt->optlen == 0) 986 return put_user(0, optlen); 987 988 ip_options_undo(opt); 989 990 len = min_t(unsigned int, len, opt->optlen); 991 if (put_user(len, optlen)) 992 return -EFAULT; 993 if (copy_to_user(optval, opt->__data, len)) 994 return -EFAULT; 995 return 0; 996 } 997 case IP_PKTINFO: 998 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; 999 break; 1000 case IP_RECVTTL: 1001 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; 1002 break; 1003 case IP_RECVTOS: 1004 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; 1005 break; 1006 case IP_RECVOPTS: 1007 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; 1008 break; 1009 case IP_RETOPTS: 1010 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; 1011 break; 1012 case IP_PASSSEC: 1013 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; 1014 break; 1015 case IP_TOS: 1016 val = inet->tos; 1017 break; 1018 case IP_TTL: 1019 val = (inet->uc_ttl == -1 ? 1020 sysctl_ip_default_ttl : 1021 inet->uc_ttl); 1022 break; 1023 case IP_HDRINCL: 1024 val = inet->hdrincl; 1025 break; 1026 case IP_MTU_DISCOVER: 1027 val = inet->pmtudisc; 1028 break; 1029 case IP_MTU: 1030 { 1031 struct dst_entry *dst; 1032 val = 0; 1033 dst = sk_dst_get(sk); 1034 if (dst) { 1035 val = dst_mtu(dst); 1036 dst_release(dst); 1037 } 1038 if (!val) { 1039 release_sock(sk); 1040 return -ENOTCONN; 1041 } 1042 break; 1043 } 1044 case IP_RECVERR: 1045 val = inet->recverr; 1046 break; 1047 case IP_MULTICAST_TTL: 1048 val = inet->mc_ttl; 1049 break; 1050 case IP_MULTICAST_LOOP: 1051 val = inet->mc_loop; 1052 break; 1053 case IP_MULTICAST_IF: 1054 { 1055 struct in_addr addr; 1056 len = min_t(unsigned int, len, sizeof(struct in_addr)); 1057 addr.s_addr = inet->mc_addr; 1058 release_sock(sk); 1059 1060 if (put_user(len, optlen)) 1061 return -EFAULT; 1062 if (copy_to_user(optval, &addr, len)) 1063 return -EFAULT; 1064 return 0; 1065 } 1066 case IP_MSFILTER: 1067 { 1068 struct ip_msfilter msf; 1069 int err; 1070 1071 if (len < IP_MSFILTER_SIZE(0)) { 1072 release_sock(sk); 1073 return -EINVAL; 1074 } 1075 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { 1076 release_sock(sk); 1077 return -EFAULT; 1078 } 1079 err = ip_mc_msfget(sk, &msf, 1080 (struct ip_msfilter __user *)optval, optlen); 1081 release_sock(sk); 1082 return err; 1083 } 1084 case MCAST_MSFILTER: 1085 { 1086 struct group_filter gsf; 1087 int err; 1088 1089 if (len < GROUP_FILTER_SIZE(0)) { 1090 release_sock(sk); 1091 return -EINVAL; 1092 } 1093 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { 1094 release_sock(sk); 1095 return -EFAULT; 1096 } 1097 err = ip_mc_gsfget(sk, &gsf, 1098 (struct group_filter __user *)optval, optlen); 1099 release_sock(sk); 1100 return err; 1101 } 1102 case IP_PKTOPTIONS: 1103 { 1104 struct msghdr msg; 1105 1106 release_sock(sk); 1107 1108 if (sk->sk_type != SOCK_STREAM) 1109 return -ENOPROTOOPT; 1110 1111 msg.msg_control = optval; 1112 msg.msg_controllen = len; 1113 msg.msg_flags = 0; 1114 1115 if (inet->cmsg_flags & IP_CMSG_PKTINFO) { 1116 struct in_pktinfo info; 1117 1118 info.ipi_addr.s_addr = inet->rcv_saddr; 1119 info.ipi_spec_dst.s_addr = inet->rcv_saddr; 1120 info.ipi_ifindex = inet->mc_index; 1121 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 1122 } 1123 if (inet->cmsg_flags & IP_CMSG_TTL) { 1124 int hlim = inet->mc_ttl; 1125 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); 1126 } 1127 len -= msg.msg_controllen; 1128 return put_user(len, optlen); 1129 } 1130 case IP_FREEBIND: 1131 val = inet->freebind; 1132 break; 1133 default: 1134 release_sock(sk); 1135 return -ENOPROTOOPT; 1136 } 1137 release_sock(sk); 1138 1139 if (len < sizeof(int) && len > 0 && val>=0 && val<=255) { 1140 unsigned char ucval = (unsigned char)val; 1141 len = 1; 1142 if (put_user(len, optlen)) 1143 return -EFAULT; 1144 if (copy_to_user(optval,&ucval,1)) 1145 return -EFAULT; 1146 } else { 1147 len = min_t(unsigned int, sizeof(int), len); 1148 if (put_user(len, optlen)) 1149 return -EFAULT; 1150 if (copy_to_user(optval,&val,len)) 1151 return -EFAULT; 1152 } 1153 return 0; 1154 } 1155 1156 int ip_getsockopt(struct sock *sk, int level, 1157 int optname, char __user *optval, int __user *optlen) 1158 { 1159 int err; 1160 1161 err = do_ip_getsockopt(sk, level, optname, optval, optlen); 1162 #ifdef CONFIG_NETFILTER 1163 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1164 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1165 !ip_mroute_opt(optname)) { 1166 int len; 1167 1168 if (get_user(len,optlen)) 1169 return -EFAULT; 1170 1171 lock_sock(sk); 1172 err = nf_getsockopt(sk, PF_INET, optname, optval, 1173 &len); 1174 release_sock(sk); 1175 if (err >= 0) 1176 err = put_user(len, optlen); 1177 return err; 1178 } 1179 #endif 1180 return err; 1181 } 1182 1183 #ifdef CONFIG_COMPAT 1184 int compat_ip_getsockopt(struct sock *sk, int level, int optname, 1185 char __user *optval, int __user *optlen) 1186 { 1187 int err; 1188 1189 if (optname == MCAST_MSFILTER) 1190 return compat_mc_getsockopt(sk, level, optname, optval, optlen, 1191 ip_getsockopt); 1192 1193 err = do_ip_getsockopt(sk, level, optname, optval, optlen); 1194 1195 #ifdef CONFIG_NETFILTER 1196 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1197 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1198 !ip_mroute_opt(optname)) { 1199 int len; 1200 1201 if (get_user(len, optlen)) 1202 return -EFAULT; 1203 1204 lock_sock(sk); 1205 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); 1206 release_sock(sk); 1207 if (err >= 0) 1208 err = put_user(len, optlen); 1209 return err; 1210 } 1211 #endif 1212 return err; 1213 } 1214 1215 EXPORT_SYMBOL(compat_ip_getsockopt); 1216 #endif 1217 1218 EXPORT_SYMBOL(ip_cmsg_recv); 1219 1220 EXPORT_SYMBOL(ip_getsockopt); 1221 EXPORT_SYMBOL(ip_setsockopt); 1222